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Adsorption equilibria of water vapor on cork.

TitleAdsorption equilibria of water vapor on cork.
Publication TypeJournal Article
Year of Publication2010
AuthorsLequin, S., Chassagne D., Karbowiak T., Gougeon R., Brachais L., & Bellat J-P.
JournalJournal of agricultural and food chemistry
Volume58
Issue6
Pagination3438 - 45
Date Published2010///
KeywordsAdsorption, Plant Bark, Plant Bark: chemistry, Quercus, Quercus: chemistry, Thermodynamics, water, Water: chemistry
Abstract

We report here for the first time a complete thermodynamic study of water vapor adsorption on crude cork powder and plate. Adsorption-desorption isotherms were accurately measured by thermogravimetry at 283, 298, and 313 K in a large range of relative pressure. Adsorption enthalpies were determined by calorimetry as a function of loading. Adsorption-desorption isotherms exhibit a hysteresis due to the swelling of the material. The influence of the presence of lenticels on the adsorption properties of cork is found to be negligible. A detailed analysis and interpretation of adsorption data allow proposal of an adsorption mechanism in two steps. (i) First, water adsorbs on hydrophilic sites constituted by hydroxyl and methoxyl groups. (ii) Then water adsorption continues by clusters formation around the hydrophilic sites.
URLhttp://www.ncbi.nlm.nih.gov/pubmed/20192215